The XC9248 supports FeedBack voltage with an accuracy of +/-1.5%. The XC9248 integrates a high precision internal reference voltage generator with temperature characteristics of 40 ppm/C. Since the oscillating frequency accuracy is as high as 10% and there is little variation by temperature, the decrease of efficiency by a frequency and the variation of radiation noise from the coil are suppressed. Furthermore, as the PWM control by “Full time synchronous rectification” is adopted, the peak to peak coil current is constant throughout the current load. Therefore, there is no pulse skip in a light load current, and ripple on the output voltage is greatly reduced throughout the current load range. The combination of these features allow for a low noise design.